Tray for carrying out chemical and biological tests



FIG. 1 is a perspective view of a tray for carrying out chemical and biological tests showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a sectional view thereof taken on line V--V of FIG. 1; and,

FIG. 6 is a sectional view thereof taken on line VI--VI in FIG. 1. 

The ornamental design for a tray for carrying out chemical and biological tests, substantially as shown and described. 